Discovery of a new Y dwarf: WISE J030449.03-270508.3

D. J. Pinfield; M. Gromadzki; S. K. Leggett; J. Gomes; N. Lodieu; R. Kurtev; A. C. Day-Jones; M. T. Ruiz; N. J. Cook; C. V. Morley; M. S. Marley; F. Marocco; R. L. Smart; H. R.A. Jones; P. W. Lucas; Y. Beletsky; V. D. Ivanov; B. Burningham; J. S. Jenkins; C. Cardoso; J. Frith; J. R.A. Clarke; M. C. Gálvez-Ortiz; Z. Zhang

doi:10.1093/mnras/stu1540

Discovery of a new Y dwarf: WISE J030449.03-270508.3

D. J. Pinfield, M. Gromadzki, S. K. Leggett, J. Gomes, N. Lodieu, R. Kurtev, A. C. Day-Jones, M. T. Ruiz, N. J. Cook, C. V. Morley, M. S. Marley, F. Marocco, R. L. Smart, H. R.A. Jones, P. W. Lucas, Y. Beletsky, V. D. Ivanov, B. Burningham, J. S. Jenkins, C. CardosoJ. Frith, J. R.A. Clarke, M. C. Gálvez-Ortiz, Z. Zhang

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Abstract

We present a new Y dwarf, WISE J030449.03-270508.3, confirmed from a candidate sample designed to pick out low-temperature objects from the Wide-field Infrared Survey Explorer (WISE) data base. The new object is typed Y0pec following a visual comparison with spectral standards, and lies at a likely distance of 10-17 pc. Its tangential velocity suggests thin disc membership, but it shows some spectral characteristics that suggest that it may be metal poor and/or older than previously identified Y0 dwarfs. Based on trends seen for warmer latetype T dwarfs, the Y-band flux peak morphology is indicative of sub-solar metallicity, and the enhanced red wing of the J-band flux peak offers evidence for high gravity and/or low metallicity (with associated model trends suggesting an age closer to ~ 10 Gyr and mass in the range 0.02-0.03 M_⊙1). This object may thus be extending the population parameter space of the known Y0 dwarfs.

Original language	English (US)
Pages (from-to)	1931-1939
Number of pages	9
Journal	Monthly Notices of the Royal Astronomical Society
Volume	444
Issue number	2
DOIs	https://doi.org/10.1093/mnras/stu1540
State	Published - Oct 21 2014
Externally published	Yes

Keywords

Brown dwarfs
Stars: Low-mass
Surveys

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1093/mnras/stu1540

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Pinfield, D. J., Gromadzki, M., Leggett, S. K., Gomes, J., Lodieu, N., Kurtev, R., Day-Jones, A. C., Ruiz, M. T., Cook, N. J., Morley, C. V., Marley, M. S., Marocco, F., Smart, R. L., Jones, H. R. A., Lucas, P. W., Beletsky, Y., Ivanov, V. D., Burningham, B., Jenkins, J. S., ... Zhang, Z. (2014). Discovery of a new Y dwarf: WISE J030449.03-270508.3. Monthly Notices of the Royal Astronomical Society, 444(2), 1931-1939. https://doi.org/10.1093/mnras/stu1540

Pinfield, DJ, Gromadzki, M, Leggett, SK, Gomes, J, Lodieu, N, Kurtev, R, Day-Jones, AC, Ruiz, MT, Cook, NJ, Morley, CV, Marley, MS, Marocco, F, Smart, RL, Jones, HRA, Lucas, PW, Beletsky, Y, Ivanov, VD, Burningham, B, Jenkins, JS, Cardoso, C, Frith, J, Clarke, JRA, Gálvez-Ortiz, MC & Zhang, Z 2014, 'Discovery of a new Y dwarf: WISE J030449.03-270508.3', Monthly Notices of the Royal Astronomical Society, vol. 444, no. 2, pp. 1931-1939. https://doi.org/10.1093/mnras/stu1540

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abstract = "We present a new Y dwarf, WISE J030449.03-270508.3, confirmed from a candidate sample designed to pick out low-temperature objects from the Wide-field Infrared Survey Explorer (WISE) data base. The new object is typed Y0pec following a visual comparison with spectral standards, and lies at a likely distance of 10-17 pc. Its tangential velocity suggests thin disc membership, but it shows some spectral characteristics that suggest that it may be metal poor and/or older than previously identified Y0 dwarfs. Based on trends seen for warmer latetype T dwarfs, the Y-band flux peak morphology is indicative of sub-solar metallicity, and the enhanced red wing of the J-band flux peak offers evidence for high gravity and/or low metallicity (with associated model trends suggesting an age closer to ~ 10 Gyr and mass in the range 0.02-0.03 M⊙1). This object may thus be extending the population parameter space of the known Y0 dwarfs.",

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AU - Pinfield, D. J.

AU - Gromadzki, M.

AU - Leggett, S. K.

AU - Gomes, J.

AU - Lodieu, N.

AU - Kurtev, R.

AU - Day-Jones, A. C.

AU - Ruiz, M. T.

AU - Cook, N. J.

AU - Morley, C. V.

AU - Marley, M. S.

AU - Marocco, F.

AU - Smart, R. L.

AU - Jones, H. R.A.

AU - Lucas, P. W.

AU - Beletsky, Y.

AU - Ivanov, V. D.

AU - Burningham, B.

AU - Jenkins, J. S.

AU - Cardoso, C.

AU - Frith, J.

AU - Clarke, J. R.A.

AU - Gálvez-Ortiz, M. C.

AU - Zhang, Z.

PY - 2014/10/21

Y1 - 2014/10/21

N2 - We present a new Y dwarf, WISE J030449.03-270508.3, confirmed from a candidate sample designed to pick out low-temperature objects from the Wide-field Infrared Survey Explorer (WISE) data base. The new object is typed Y0pec following a visual comparison with spectral standards, and lies at a likely distance of 10-17 pc. Its tangential velocity suggests thin disc membership, but it shows some spectral characteristics that suggest that it may be metal poor and/or older than previously identified Y0 dwarfs. Based on trends seen for warmer latetype T dwarfs, the Y-band flux peak morphology is indicative of sub-solar metallicity, and the enhanced red wing of the J-band flux peak offers evidence for high gravity and/or low metallicity (with associated model trends suggesting an age closer to ~ 10 Gyr and mass in the range 0.02-0.03 M⊙1). This object may thus be extending the population parameter space of the known Y0 dwarfs.

AB - We present a new Y dwarf, WISE J030449.03-270508.3, confirmed from a candidate sample designed to pick out low-temperature objects from the Wide-field Infrared Survey Explorer (WISE) data base. The new object is typed Y0pec following a visual comparison with spectral standards, and lies at a likely distance of 10-17 pc. Its tangential velocity suggests thin disc membership, but it shows some spectral characteristics that suggest that it may be metal poor and/or older than previously identified Y0 dwarfs. Based on trends seen for warmer latetype T dwarfs, the Y-band flux peak morphology is indicative of sub-solar metallicity, and the enhanced red wing of the J-band flux peak offers evidence for high gravity and/or low metallicity (with associated model trends suggesting an age closer to ~ 10 Gyr and mass in the range 0.02-0.03 M⊙1). This object may thus be extending the population parameter space of the known Y0 dwarfs.

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KW - Stars: Low-mass

KW - Surveys

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Discovery of a new Y dwarf: WISE J030449.03-270508.3

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Keywords

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